An architect plans to build a moving skyscraper in Dubai. It will have 80 stories. This is 20% fewer stories than the John Hancock Center in Chicago. Based on these facts, how many stories are in the John Hancock Center?

We can solve this using an equation, with x representing the amount of stories on the John Hancock center.

x x. 8 = 80

Isolate the x by negating the operation of x. 8 by dividing by. 8 on both sides.

80 /.8 = 100

x = 100

There are 100 stories in the John Hancock Center in Chicago.

Another way to think of it is the moving skyscraper is the skyscraper is 80% of 100, so a proportion of 80:100 = height of the moving skyscraper : John Hancock Center. Luckily, the skyscraper is already 80, so we know the John Hancock Center is 100 stories high.